FocusBySnapQuiz is a Chrome extension designed to improve concentration while watching online courses on platforms like Bilibili and YouTube. This free tool automatically displays quiz questions at user-defined intervals, directly related to the content being viewed. It aims to keep users engaged and reinforce their understanding of the material by prompting them with relevant questions during the video playback.

The extension is particularly useful for students and learners who wish to maintain their focus and retention of information presented in video format. By integrating timed quizzes into the viewing experience, FocusBySnapQuiz not only encourages active participation but also enhances memory recall and comprehension of the subject matter.